Greece’s banks are quickly running out of cash, as Prime Minister Alexis Tsipras takes his latest bailout proposal to the country’s eurozone creditors, days after Greek voters overwhelmingly rejected their latest bailout offer.

Officials on Monday announced that the banks would remain closed until Thursday, as the European Central Bank (ECB) slowly tightened a noose on its funding.

The daily withdrawal limits were to remain unchanged at 60 euros ($66) per account daily.

Al Jazeera’s John Psaropoulos, reporting from Athens, said Greek banks were now operating “under siege”, with one major Athens bank only able to keep its ATMs open on Monday after two major companies deposited their payrolls in cash.

“The banks are living day-to-day and hand-to-mouth,” Psaropoulos said.

“They believe they have enough to keep going until Wednesday, possibly Thursday, but only under the capital controls (withdrawal limits).”

The ECB has maintained its emergency liquidity lifeline for Greek banks, however it raised charges on collateral the banks require to present for funds, effectively devaluing the banks’ assets and making them less able to borrow against their collateral.

Greece last week defaulted on a $1.8bn repayment to the International Monetary Fund, and on Sunday, in a referendum, the Greek people voted to say “no” to Europe’s bailout deal.

Rapid negotiations

Tsipras on Tuesday must persuade Europe’s other 18 leaders, many of whom are exasperated after five years of the Greek crisis, to open rapid negotiations for a major new loan to rescue his country.

He spoke to German Chancellor Angela Merkel regarding the new proposals ahead of Tuesday’s hastily arranged emergency summit of the eurozone countries in Brussels.

Germany and France, whose economies together account for nearly half of the eurozone, on Monday asked Greece to make detailed proposals to revive bailout talks, a day after the referendum that decisively rejected creditors’ demands for further austerity.

Late on Monday, a Greek government source said that Tsipras had spoken to ECB chief Mario Draghi in efforts to reopen banks with assistance from the Frankfurt-based lender.

Tsipras also spoke to IMF chief Christine Lagarde “on the need to find a viable solution dealing with the real problems of the Greek economy”, the source said.

Lagarde said the IMF was “ready to assist Greece if requested to do so”, despite the June 30 default.

European Commission head Jean-Claude Juncker said on Tuesday that while he did not want Greece to leave the eurozone, in a so-called Grexit, the Greek people had voted on a deal that “no longer existed”.

“We have to put a very large ego away and deal with the situation we face,” Juncker said.

Tsipras insists that instead of a Grexit, Greece’s creditors will now finally have to talk about restructuring the country’s massive 240 billion euro ($267bn) debt to them.